I’ve read a book from Fr. Belet that states,
"The person who maliciously robs his neighbor’s reputation is held to restoring it on the same level as someone who steals. If what you said is secret even though it be true, you are obliged to restore his reputation. Otherwise you will not go to heaven.
“But how can I restore it? you may ask. You must tell everyone present when you spoke ill not to believe you, that you spoke out of wickedness. If the person you defamed knows about it you are duty bound to ask his forgiveness, etc. Many have been damned for such defamations because words pass and we forget having said them; they make no scruples over them and never think of confessing them.”
Now, I’ve been under the impression that all sins committed but forgotten can be forgiven in a regular confession (even if forgotten and not mentioned specifically) so how can this book say a person can be damned?